#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
int belong[100001];
pair<int, int> f[100001];
vector<pair<int, ll>> v[100001];
int main()
{
cin.tie(0);
cout.tie(0);
ios::sync_with_stdio(0);
int n, q;
cin >> n >> q;
for (int i = 0; i < n; i++)
{
cin >> f[i].first >> f[i].second;
}
int counter = 0;
for (int i = 0; i < n; i++)
{
if (belong[i])
{
continue;
}
int place = i, liquid = 0;
v[counter].push_back({place, 0});
belong[place] = counter;
liquid += f[place].second;
bool possible = true;
while (possible)
{
possible = false;
for (int j = place; j <= n; j++)
{
if (f[j].first > f[place].first)
{
belong[j] = counter;
possible = true;
place = j;
v[counter].push_back({j, liquid + 1});
liquid += f[j].second;
break;
}
}
}
v[counter].push_back({-1, liquid + 1});
counter++;
}
int start, hold;
for (int i = 0; i < q; i++)
{
cin >> start >> hold;
start--;
int moves = 100, sz = v[belong[start]].size(), minus = 0;
int l = 0, r = sz;
if (v[belong[start]][0].first != start)
{
while (l + 1 < r)
{
int mid = (l + r) / 2;
if (v[belong[start]][mid].first == start)
{
l = mid;
break;
}
if (v[belong[start]][mid].first > start)
{
r = mid;
}
if (v[belong[start]][mid].first < start)
{
l = mid;
}
}
minus = v[belong[start]][l].second - 1;
}
r = sz;
while (moves--)
{
if (l + r < sz)
{
if (hold >= v[belong[start]][l + r].second - minus)
{
l += r;
}
}
r = max(r / 2, 1);
}
cout << v[belong[start]][l].first + 1 << "\n";
}
}
